JP3177136B2 - Casing extraction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casing pulling-out apparatus for pulling out a casing buried underground when constructing a pile hole.

[0002]

2. Description of the Related Art Conventionally, in a reverse circulation method (hereinafter referred to as a reverse method) or an earth drill method, a stand pipe or a casing called a surface casing is erected during pile construction to prevent collapse of a hole wall near the ground surface. And so on.

In the reverse construction method, water is injected into a casing, drilling is performed with a drill bit at the tip of a drill, and earth and sand are drained together with muddy water for drilling. In the earth drilling method, a drilling bucket is inserted into a casing, drilling is performed by rotating the drilling bucket, and the excavated earth and sand is taken into the drilling bucket. Then, the drilling bucket is raised to discharge the soil. After the formation of the pile hole, the steel cage was inserted and the concrete was cast, and then the wire rope was connected to the casing and pulled out from the ground by a crane.

[0004]

However, since the casing is subjected to lateral pressure from the hole wall, the casing cannot be easily pulled out, and in some cases, the wire rope breaks, particularly during the period when the casing is erected. When the length is long, there is a problem that a large pulling force is required and the pulling out is not easy.

[0005] An object of the present invention is to provide a casing withdrawing device that can easily pull out a casing.

[0006]

In order to achieve the above object, the present invention takes the following means to solve the problem. That is, a pair of jacks installed on both sides of the casing that built up in the ground, with halides to the beam member across the top the casing between the jack, clays the beams member
Attach the latch member on which the wire rope of
Serial suspended a pair of lifting lugs swingably at intervals corresponding to the diameter of the casing to the beam member, a casing extracting device, characterized in that for connecting the casing and該吊Ri fitting is it.

[0007] The hanging bracket may swing and slidably hang on a fulcrum shaft horizontally supported by the beam member. Further, the hanging bracket may swing on the fulcrum shaft. A first hanging bracket movably and slidably suspended,
A second suspension fitting may be provided that is swingably connected to the first suspension fitting and is connected to the casing.

Alternatively, the beam member may be expandable and contractible in the axial direction, and the beam member may be divided so that an extension member can be interposed therebetween.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1, reference numeral 1 denotes a casing, which is built by a vibrohammer or the like (not shown) when a pile hole is constructed. As shown in FIG. 4, a pair of through-holes 2 and 4 are formed in the upper edge of the casing 1 in advance.

A pair of hydraulic jacks 6 and 8 are provided on both sides of the casing 1.
8 is provided with hydraulic cylinders 10 and 12;
The rod sides 0 and 12 are fixed to the bases 14 and 16. A pair of guide plates 18 to 21 are provided on the bases 14 and 16 along the hydraulic cylinders 10 and 12, respectively, and slidably support the outer circumference of the cylinder tubes of the hydraulic cylinders 10 and 12. I have.

Mounting bases 22 and 24 are fixed to the cylinder tubes of the hydraulic cylinders 10 and 12 so as to face each other (see FIG. 4). Fixed bases 28 and 30 at both ends are fixed. The beam member 26 extends between the mounts 22 and 24 across the casing 1.

On the lower surface of the beam member 26, a pair of fulcrum shafts 3 are provided.
Support members 3 projecting from the lower surface of beam member 26
6 to 39 are inserted and supported. Both fulcrum shafts 32,
The intervals of 34 are arranged so as to be substantially equal to the diameter of the casing 1. A pair of latch members 40 and 42 are mounted on the upper surface of the beam member 26 at predetermined intervals.

The first suspension brackets 44 and 46 are swingable on the two fulcrum shafts 32 and 34, respectively.
4 is slidably inserted in the axial direction and hangs down. Second suspending members 48 and 50 are swingably connected to the first suspending members 44 and 46 by pins 52 and 54 and are suspended therefrom. The second suspension fittings 48, 50 are connected to the casing 1 by bolts 56, 58 inserted into the through holes 2, 4 of the casing 1 (see FIG. 4). In the present embodiment, the first hanging members 44 and 46, the second hanging members 48 and 50,
Although the hanging bracket is constituted by the pins 52 and 54, the first
The present invention is also applicable to the case where the hanging metal fittings 44 and 46 and the second hanging metal fittings 48 and 50 are constituted by an integral member.

Next, the operation of the above-described casing extracting device of the present embodiment will be described. Insert a steel cage into the pile hole,
After the concrete is cast, when the casing 1 is pulled out, the wire ropes 60 are hung on the latch members 40 and 42 as shown in FIG. Lifted by a crane (not shown), the hydraulic jacks 6 and 8 are installed on both sides of the casing 1 and the beam members 26 are traversed through the center of the casing 1.

Thereafter, the first suspension fittings 44, 46 and the second
The first hanging members 44, 46 are connected to the fulcrum shaft 32, so that the hanging members 48, 50 are spaced according to the diameter of the casing 1.
Slide along 34. After adjusting the interval, the second suspension fittings 48, 50 and the casing 1 are connected by bolts 56, 58.

Then, the hydraulic cylinders 10, 12 are driven to the extension side to raise the beam member 26. Therefore, FIG.
As shown in (b), the support members 36 to 39, the fulcrum shaft 3
2, 34, first suspension fittings 44, 46, pins 52, 54,
The casing 1 is pulled out from the ground via the second suspension fittings 48, 50 and the bolts 56, 58. When the casing 1 is pulled out from the ground at all, the frictional resistance between the outer periphery of the casing 1 and the hole wall is sharply reduced, and thereafter, the casing 1 can be pulled out with a small force. Therefore, the hydraulic cylinders 10 and 12 do not need a stroke to completely pull out the casing 1.

After the hydraulic cylinders 10 and 12 are fully extended, the whole is lifted by a crane (not shown) and the casing 1 is completely pulled out. Also, the hydraulic cylinder 10,
Then, the casing 1 is driven to the reduction side, and the casing 1 is moved to a place away from the pile hole by the crane, and is slowly lowered to the ground.

At this time, as shown in FIG. 2D, when the casing 1 is brought into contact with the ground and then lowered by moving the casing pulling device sideways by a crane, the casing 1 is turned over. At that time, the first suspension fittings 44, 46
And the second suspension fittings 48 and 50 include the fulcrum shaft 34, the pin 52,
By swinging relatively around the bolts 54 and the bolts 56 and 58, the casing pulling device is maintained in a state of being suspended vertically from the wire rope 60.

Then, as shown in FIG. 2 (e), after the casing 1 is completely laid down, the bolts 56, 58 are removed, and the connection between the second hanging members 48, 50 and the casing 1 is released. Next, as shown in FIG. 2 (f), the casing extracting device is lowered onto the ground, and the operation is completed.

Next, a second embodiment different from the above-described embodiment will be described with reference to FIG. The same members as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. The same applies hereinafter. The beam member 26 of the second embodiment differs from the beam member 26 of the second embodiment in that the beam members 70 of the second embodiment include square tube members 72 and 74 to which the fixing bases 28 and 30 are attached, respectively. , A connecting member 76 made of I-shaped steel is slidably inserted. Both fixed bases 28,
30 and the connecting member 76 are connected to cylinders 78 and 80, respectively.
Are connected by

By extending and retracting the cylinders 78 and 80, the distance between the two hydraulic jacks 6 and 8 can be changed, and the first suspension fittings 44 and 46 and the second suspension fitting 4 can be changed.
The intervals of 8,50 can be changed, and it can correspond to the casing 1 of various diameters.

Next, a third embodiment will be described with reference to FIG. The beam member 90 of the third embodiment includes arm members 92 and 94 to which the fixing bases 28 and 30 are attached, respectively, and the arm members 92 and 94 are provided with flange portions 96 and 98 facing each other. . An extension member 104 provided with flange portions 100 and 102 at both ends is interposed between the arm members 92 and 94, and each of the flange portions 96 and 9 is provided.
8, 100 and 102 are joined by bolts (not shown).

By preparing various extension members 104 having different lengths in advance and exchanging the extension members 104, it is possible to change the interval between the two hydraulic jacks 6, 8 as in the second embodiment. The distance between the first hanging members 44 and 46 and the second hanging members 48 and 50 can be changed, so that the casing 1 can have various diameters. Moreover,
It can be implemented with a simple configuration.

As described above, the present invention is not limited to such an embodiment, and can be implemented in various modes without departing from the gist of the present invention.

[0025]

As described in detail above, the casing pulling device of the present invention connects the hanging metal to the casing and pulls out the casing by the jack, so that the casing can be pulled out reliably and easily. Swings, so that the casing after being pulled out can be easily turned over. Further, by making the hanging metal slidable on the support shaft, the position of the hanging metal can be easily adjusted to the outer periphery of the casing 1. Further, by allowing the beam member to expand and contract in the axial direction and to allow the extension member to be interposed, it is possible to cope with casings having various diameters.

[Brief description of the drawings]

FIG. 1 is a perspective view of a casing extracting device as one embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a procedure of drawing using the casing drawing device of the present embodiment.

FIG. 3 is an explanatory view showing a procedure for turning over a casing after being pulled out using the casing pulling-out device of the present embodiment.

FIG. 4 is a front view of a casing extracting device according to a second embodiment.

FIG. 5 is a front view of a casing extracting device according to a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Casing 6,8 ... Hydraulic jack 26, 70, 90 ... Beam member 32, 34 ... Support shaft 44, 46 ... 1st suspension fitting 48, 50 ... 2nd suspension fitting 104 ... Extension member

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E02D 9/02

Claims (5)

(57) [Claims] [Claim 1 further comprising a pair of jacks installed on both sides of the casing that built up in the ground, with halides to the beam member across the top the casing between the jack, the beams portion
Remove the latch member on which the wire rope of the crane is
Ri with said pair of lifting lugs at intervals corresponding to the diameter of the casing on the beam member swingably suspended, casing extracting device, characterized in that for connecting the casing and該吊Ri fitting. 2. The casing pulling-out device according to claim 1, wherein the hanging bracket is swingably and slidably hung on a fulcrum shaft horizontally supported by the beam member. 3. The hanging member is swingably and slidably suspended on the fulcrum shaft, and is slidably suspended on the first hanging member. The first hanging member is swingably connected to the first hanging member and connected to the casing. The casing pulling device according to claim 2, further comprising a second hanging metal fitting. 4. The casing pulling device according to claim 1, wherein the beam member is capable of extending and contracting in an axial direction. 5. The casing extracting device according to claim 1, wherein the beam member is divided so that an extension member can be interposed therebetween.